You will find further information on the subject of transmitting power by compressed air, in our editorial columns of last week.

Our appearance at Philadelphia has drawn the attention of American manufacturers to us in a most marked and unexpected degree.

The North Pole itself is only shrouded in perfect blackness from November 13 to January 29, a period of seventy-seven days.

Carriage Wheels.—James D. Sarven, New Haven, Conn., has petitioned for an extension of the above patent. Day of hearing May 24, 1871.

One peculiarity is alone common to them and man, and this is the habit of lying upon the back in sleep.

The Arctic was afterward run into by a French vessel at sea and only a few of her passengers were saved.

Inquiries relating to patents, or to the patentability of inventions, assignments, etc., will not be published here.

All communications are treated as confidential.

Persons who have sent numbers of the Scientific American to this office, for the purpose of having them bound, will please call or send for them immediately.

The foot is so squeezed upward that, in walking, only the ball of the great toe touches the ground.

This invention relates to a new and useful compound for lubricating railroad car axle journals, and other journal bearings.

The metal used was lead and antimony, seven to one.

388.—Iron Rails and Bars, and Modes of Manufacturing the same.—Eldridge Wheeler, Philadelphia, Pa. February 15, 1871.

Full information, as to price of drawings, in each case, may be had by addressing

4,294.—Apparatus for Pitching Barrels.—Louis Schulze, Baltimore, Md. Patent No. 106,964, dated August 30, 1870.

4,699.—Back of a Chair or Sofa.—George Unverzagt, Philadelphia, Pa.

Seeding Machine.—Lewis B. Myers and Henry A. Myers, Elmore, Ohio. Letters Patent No. 16,772, dated March 3, 1857.

The Scientific American will be delivered in every part of the city at $3.50 a year.

Engravings may head advertisements at the same rate per line, by measurement, as the letter-press.

The Circular Stocking Frame, from 2 in. to 5½ in. diameter. These circular frames, with my last improvements, are as near perfection as possible.